Category: Electronics Projects

Electric guitar preamp circuit

Engineeering Projects
author prototype of guitar pre-amplifier box

The entire circuit of the ‘Electric guitar preamp circuit’ is divided into small sections to ensure simplicity and easy understanding of the project. The first section comprises a single transistor that serves as a common-emitter amplifier. Be it in melodious songs or in rock songs, the guitar is an inseparable part of music in today’s world. To extend the level of sound such that it can be heard by every individual in a mass, amplifier circuits are extensively incorporated into the music system. And this circuit represents a similar concept.…

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Frequency Counter Schematic using Microcontroller AT89C51

Engineeering Projects
circuit diagram of frequency counter

Frequency Counter Schematic using Microcontroller AT89C51 is a simple yet mostly used frequency counter schematic used. The reason behind its simplicity also lies somewhere in the fact that this project uses only two components-AT89C2051 microcontrollers and a 16*2 LCD. Frequency is a crucial subject matter in every project. Precise and accurate frequency generation is another challenge we face in varieties of project design. As per the design of this project, this circuit can withstand frequency ranges between 1 Hz to ~16.5 Mhz, and the rest depends on the characteristics of…

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AC Motor Speed Controller Circuit Using AT89C51

Engineeering Projects
author prototype of ac motor speed controller

Here is a simple circuit “AC Motor Speed Controller Circuit Using Microcontroller” which is used to control the speed of AC motor using microcontroller At89c51. The circuit uses the principle of changing the firing angle of TRIAC to control the speed of the motor. Here, in this project, we had to use various switches to control the speed whereas an LED bar graph is used to indicate the speed of the motor. Circuit Description of AC Motor Speed Controller Circuit Using AT89C51 The circuit diagram of the signal phase AC…

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Sound detector circuit using op-amp 741

Engineeering Projects
sound detector circuit using 741 IC

The circuit diagram of the sound detector circuit using op-amp 741 is shown in figure 1. The heart of the circuit is op-amp 741 which is used in order to sense the vibrations of sound waves condenser microphones. Introduction of Sound detector circuit using op-amp 741 Sometimes due to lack of concentration and our ignorance, we are unable to hear anything around us. And, that could lead to unfortunate misfortunes which could have been avoided with appropriate precautions. This circuit called ‘Sound Detector’ is what detects vibrations of the sound waves…

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12v, 7Ah Smart Battery Charger with PCB Diagram

Engineeering Projects
circuit diagram of 12V 7ah smart battery charger

Here is a 12V, 7Ah smart battery charger circuit which is also referred to as a smart charger uses three-stage of charging i.e. bulk stage, absorption stage, and float stage. Normal battery charger technology uses single-stage battery charging technology i.e. only charge the battery up to the maximum charging voltage preset by the charging circuit. Now here is a 12V, 7Ah smart battery charging circuit which is also referred to as a smart charger uses three-stage of charging i.e. bulk stage, absorption stage, and float stage. You may also like Arduino…

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9V DC to plus/minus 5V DC converter

Engineeering Projects
circuit diagram of dual polarity 5 v from 9V

Presented here is a simple circuit “9V DC to plus/minus 5V DC converter” that can convert a 9V battery to plus/minus 5V DC supply using LM7805 and ICL 7660. The operational amplifier requires a dual polarity power supply (+Ve and -Ve) because it has to swing on the output i.e. it does not swing into action during the negative cycle of signal if the negative source is not given. Thus, for the proper operation, we need a dual polarity power supply. Circuit Description of 9V DC to plus/minus 5V DC converter While…

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GPS Navigator Circuit using ATmega 16

Engineeering Projects
author prototype of GPS navigator

The system “GPS Navigator Circuit using ATmega 16” is implemented to detect the position/location of anything under consideration, and hence it is suited for navigation activities. Introduction to GPS Navigator Circuit using ATmega 16 The term GPS has been so popular in recent times. The credit for its quick recognition is due to the list of multiple features this system offers. Elaborated as a Global positioning system (GPS) it has already been established as a reliable technology that has made our lives much easier. Just with the involvement of GPS, we…

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GPS and GSM based Vehicle Tracking System

Engineeering Projects
circuit diagram of GPS and GSM based vehicle tracking system

The project GPS and GSM-based Vehicle Tracking System uses Global Positioning System (GPS) and global system for mobile communication (GSM), which makes this project more economic than implementing a communication system through GPS satellites in a two-way GPS communication system. Introduction to GPS and GSM based Vehicle Tracking System Tracking has now been a recent trend followed everywhere. This process helps us to collect details and at the same time prevent robbery of devices being tracked. The project ‘GPS and GSM based Vehicle Tracking System’ which employs a microcontroller as its…

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Arduino Fingerprint Sensor Lock

Engineeering Projects
arduino fingerprint sensor circuit

The project “Arduino Fingerprint Sensor Lock” is simply fabricated around Arduino board. Not only to ensure door security, this project also make certain to assist in fields like forensics, crime investigation, personal identification, attendance system and there is a lot more. Introduction of Arduino Fingerprint Sensor Lock Recently, there has been recorded tremendous increase in the crime rate everywhere in the world. This issue is turning more severe every day. To get away with this problem, we decided to take help from technology and there this project “Arduino Fingerprint Sensor Lock”…

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Microcontroller Based Solar Charger

Engineeering Projects
circuit diagram of microcontroller based solar charger

The project ‘Microcontroller Based Solar Charger’ has been so popular, that everyone knows about it. Here we will discuss the construction details and areas where this project is applicable. With excessive non-renewable energy consumption, we humans are facing plentiful difficulties. Renewable sources of energy are considered our only hope to rise from this situation. Solar energy is one of them which have spread all over for its easy availability, effective cost, and reliability. The project, ‘Microcontroller Based Solar Charger’ is the finest example to demonstrate the easy utilization of resources…

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